Another way that may be as effective in the home is to wire the studio using all metal boxes and Medical Grade AC Cable. AC cable otherwise called Armored cable is UL listed so that the armor can serve as the equipment ground. It looks similar to the old BX cable but is not at all the same. The medical Grade also has an insulated grounding conductor run inside with the other 2 conductors. Patient Care rooms per Art 517 NEC requires redundant grounding. In the case of the studio you'll use receptacles that have isolated grounds. In this way the boxes are grounded with the armor of the cable BUT the ground on the receptacles is done with the insulated equipment ground.This way the armor actually acts as a shield preventing stray currents & EMI from getting in.Mention both methods to your Electrician. If he has that "deer in the headlights" look find another Electrician.

John
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